Journal article Open Access

First observation of the Σ- π+ π+ decay mode of the Λc baryon and its branching ratio relative to the Σ+ π+ π- mode

M. Di Corato; M. Pisharody; Daniele Pedrini; F. Davenport; M. Vittone; John Perry Cumalat; S. Cihangir; P. L. Frabetti; T. F. Lin; P. Lebrun; P. H. Kasper; A. Sala; S. P. Ratti; Paul Sheldon; S. Sala; J. N. Butler; R. Culbertson; H. W.K. Cheung; W. D. Shephard; Stefano Bianco; L. Cinquini; G. Alimonti; G. P. Grim; C. Castoldi; F. Leveraro; D. Buchholz; A. E. Kreymer; E. Meroni; D. Torretta; Paolo Vitulo; S. Sarwar; S. Shukla; Luigi Moroni; L. Perasso; Cristina Riccardi; Willard Johns; V. Arena; G. Bellini; D. Claes; J. S. Kang; N. M. Cason; Z. Y. Wu; James R. Wilson; J. F. Ginkel; T. Handler; L. A. Garren; B. Caccianiga; Robert Gardner; L. Viola; G. R. Blackett; Gabriele Gianini; J. M. Bishop; R. Greene; C. Dallapicoola; Stephen A. Gourlay; A. Zallo; F. L. Fabbri; Randy Ruchti; D. J. Harding; K. Y. Kim; C. J. Kennedy; G. Boca; J. A. Swiatek; M. S. Nehring; James E Wiss; G. N. Kim; B. Gobbi; Sandra Malvezzi; P. H. Garbincius; Senta Greene; B. O'Reilly; Alan D. Lopez; P. Inzani; Marco Giammarchi; Dario Menasce; D. L. Puseljic; V. S. Paolone; I. Gaines; B. G. Cheon; P. M. Yager

Abstract We report the first observation (103±17 events) of the decay Λ+c → Σ−π+π+ and the charge conjugate. A measurement of the relative branching ratio Г (Λ + c → Σ − π + π + )/Г (Λ + c → Σ + π + π + π − = 0.53±0.15 (stat) ± 0.07 (sys) is also presented.

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